st: Extrapolating Cox predicted risk

I use Stata/IC 12.1 for Windows (32-bit). I generated predicted risk
of death for each subject in the study by means of Cox proportional
hazards model at 8 year of follow-up, a time point at which follow-up
was more than 90% complete. It is possible to extrapolate to 10-year
the predicted risk of each subjet by assuming an exponential
distribution?